At 30 degrees your beer is probably over-carbonated. The colder the liquid the easier it is to absorb excess gas. You will not experience dispensing issues until the layer of saturated beer drops down to the bottom of the keg. With the next keg adjust your temperature to about 38 degrees, apply 14 PSIG and use five feet of 3/16" ID. Be certain that the temperature is that of the beer.
Scott Zuhse, Instructor
Micro Matic Dispense Institute